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298 94 307/02 Untersuchungen zum Stand der Umsetzung des ... 298 94 307/02 Untersuchungen zum Stand der Umsetzung des ...

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Teil 3 Seite 4-51 In the region of 30 –50% of the effluent receives anaerobic pre-treatment (down-flow cir- culation reactor, Laran system of the company Linde). Although the effluent exhibits a relatively high BSB5:N ratio at 7:1 in relation to other animal carcass disposal plant efflu- ent, as a rule, just enough organic carbon remains for de-nitrification, but can be in short supply on some occasions. At a biomass concentration of approx. 7 to 8 g/l the BSB5 sludge load is 0,05 kg/(kg×d). The internal cycle is set to 300 to 400%. The BSB5:N ratio, the BSB5 volume load of 0,34 kg/(m 3 ×d) and the N-volume load of 0,16 kg/(m 3 ×d) are more or less at the upper limit of the conditions required for complete N-elimination. These ratios are also reflected in the process results ( ), especially resulting in frequently higher nitrate concentrations due to the limited carbon reserve. Table 4-14Properties of the treated effluent at the Plattling animal carcass disposal plant Table 4-14 Properties of the treated effluent at the Plattling animal carcass disposal plant Parameters Average Minimum - Maximum BSB5 homogenised mg/l 4,9 1 - 16 COD homogenised mg/l 52,5 34 - 75 NH4 -N mg/l 7,6 1 - 27 NO3 -N mg/l 39 1,2 - 99 NO2 -N mg/l 0,45 0,03 - 1,2 P total mg/l 11,9 0,9 - 28 GF 2 2 2 At the Brögbern animal flour factory, an anaerobic high performance system was com- missioned in 1989 with the aim of alleviating the pressure on the aerobic clarification plant. In the interim, the plant has been expanded further through a second, substantially larger reactor. Both are fixed bed circulation reactors in up-flow operation, filled with sin- tered glass Raschig rings (Siran ® high performance carrier material by the company Schott). This material is much more densely packed than the plastic material described and therefore allows higher COD volume loads (Table 4-15). The smaller reactor was ear- lier operated with a pre-acidification process and mainly served the purpose of anaerobic treatment of the blood process water. The entire effluent is now led through the two an- aerobic reactors, during which process nitrogen is initially eliminated from the dryer va- pours through ammonia conversion.

Teil 3 Seite 4-52 Table 4-15 Dimensional and performance data of the anaerobic reactors of the Brögbern animal carcass disposal plant Effective fixed bed volume 20 m 3 + 100 m 3 Specific surface area 30.000 m 2 / m 3 Dwell time 11 -15 h in the fixed bed reactor Internal cycle 3.000 - 4.000 % COD – inflow concentration 10.000 - 90.000 mg/l Ammonia - N inflow concentration 1.000 - 4.500 mg/l COD volume load approx. 14 kg/(m 3 ·d) COD decomposition performance 60 - 90% Reference literature 4.5.4 End of Pipe Technique 4.5.4.1 Agricultural reuse of organic liquids Definition Agricultural reuse is defined as spreading organic liquids (e.g. potato fruit juice, wheat starch process water) and biosolids (e.g. sewage sludge, composts) from food and drink processing plants on the soil making use of the agronomic value of these wastes for reuse as fully biodegradable fertilisers for crops and for the microbiological fauna of the soil without a negative influence to the environment (e.g. soils, groundwater). This agricultural reuse is also named as land spreading. Agricultural reuse is therefore different from land irrigation that is characterised by the spraying and discharging of waste water and water on the soil without control of environ- mental impacts. In this case, depending on the quality of the (waste) water, well water and soil can be contaminated. Objective The purpose of the agricultural reuse is to spread liquids and biosolids on agricultural fields, where the natural content of nutrients functions as fertilisers for crops and for mi- croorganisms where crops or soils have specific needs for nutrients. Indeed, organic liquids and biosolids from the food and drink industries are characterised by a high load of organic material. These liquids and biosolids contain not only carbon but also nitrogen and phosphorous bound to these organic matters as well as minerals. Pol- lutants are negligible.

Teil 3 Seite 4-52<br />

Table 4-15 Dimensional and performance data of the anaerobic reactors of the Brögbern<br />

animal carcass disposal plant<br />

Effective fixed bed volume 20 m 3 + 100 m 3<br />

Specific surface area 30.000 m 2 / m 3<br />

Dwell time 11 -15 h in the fixed bed reactor<br />

Internal cycle 3.000 - 4.000 %<br />

COD – inflow concentration 10.000 - 90.000 mg/l<br />

Ammonia - N inflow concentration 1.000 - 4.500 mg/l<br />

COD volume load approx. 14 kg/(m 3 ·d)<br />

COD decomposition performance 60 - 90%<br />

Reference literature<br />

4.5.4 End of Pipe Technique<br />

4.5.4.1 Agricultural reuse of organic liquids<br />

Definition<br />

Agricultural reuse is defined as spreading organic liquids (e.g. potato fruit juice, wheat<br />

starch process water) and biosolids (e.g. sewage sludge, composts) from food and drink<br />

processing plants on the soil making use of the agronomic value of these wastes for reuse<br />

as fully biodegradable fertilisers for crops and for the microbiological fauna of the soil<br />

without a negative influence to the environment (e.g. soils, groundwater). This agricultural<br />

reuse is also named as land spreading.<br />

Agricultural reuse is therefore different from land irrigation that is characterised by the<br />

spraying and discharging of waste water and water on the soil without control of environ-<br />

mental impacts. In this case, depending on the quality of the (waste) water, well water and<br />

soil can be contaminated.<br />

Objective<br />

The purpose of the agricultural reuse is to spread liquids and biosolids on agricultural<br />

fields, where the natural content of nutrients functions as fertilisers for crops and for mi-<br />

croorganisms where crops or soils have specific needs for nutrients.<br />

Indeed, organic liquids and biosolids from the food and drink industries are characterised<br />

by a high load of organic material. These liquids and biosolids contain not only carbon but<br />

also nitrogen and phosphorous bound to these organic matters as well as minerals. Pol-<br />

lutants are negligible.

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